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add good-fit for allowing larger blocks in smaller segments

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daan 2019-08-09 11:18:38 -07:00
parent 5e56b40fe6
commit 442bad9190
7 changed files with 214 additions and 35 deletions
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14
src/segment.c
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@ -236,8 +236,8 @@ static void mi_segment_os_free(mi_segment_t* segment, size_t segment_size, mi_se
// The thread local segment cache is limited to be at most 1/8 of the peak size of segments in use,
// and no more than 2.
#define MI_SEGMENT_CACHE_MAX (2)
// and no more than 4.
#define MI_SEGMENT_CACHE_MAX (4)
#define MI_SEGMENT_CACHE_FRACTION (8)
// note: returned segment may be partially reset
@ -708,16 +708,20 @@ static mi_page_t* mi_segment_huge_page_alloc(size_t size, mi_segments_tld_t* tld
/* -----------------------------------------------------------
Page allocation and free
----------------------------------------------------------- */
static bool mi_is_good_fit(size_t bsize, size_t size) {
// good fit if no more than 25% wasted
return (bsize > 0 && size > 0 && bsize < size && (size - (size % bsize)) < (size/4));
}
mi_page_t* _mi_segment_page_alloc(size_t block_size, mi_segments_tld_t* tld, mi_os_tld_t* os_tld) {
mi_page_t* page;
if (block_size <= (MI_SMALL_PAGE_SIZE/4)) {
if (block_size <= MI_SMALL_SIZE_MAX || mi_is_good_fit(block_size,MI_SMALL_PAGE_SIZE)) {
page = mi_segment_small_page_alloc(tld,os_tld);
}
else if (block_size <= (MI_MEDIUM_PAGE_SIZE/4)) {
else if (block_size <= MI_MEDIUM_SIZE_MAX || mi_is_good_fit(block_size, MI_MEDIUM_PAGE_SIZE)) {
page = mi_segment_medium_page_alloc(tld, os_tld);
}
else if (block_size < (MI_LARGE_SIZE_MAX - sizeof(mi_segment_t))) {
else if (block_size < MI_LARGE_SIZE_MAX || mi_is_good_fit(block_size, MI_LARGE_PAGE_SIZE - sizeof(mi_segment_t))) {
page = mi_segment_large_page_alloc(tld, os_tld);
}
else {